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SAN DIEGO — Human error and a malfunctioning problem are to blame for a November drone accident off the coast of Southern California that injured two sailors and caused $30 million in damage to a warship, the Navy said in a newly unclassified report.

U-T San Diego reported Friday that a Navy report recommends administrative action against the warship's then-skipper, Capt. Andrew Hesser, and three crew members for not doing enough to stop the drone from crashing into the San Diego-based Chancellorsville. The newspaper obtained a redacted copy of the report through a Freedom of Information Act request.